FazBrowse GitHub Viewer
|
Trending
|
URL:
|
Home
Tools:
[Download Repo ZIP]
[View Raw Code]
[Original HTTPS Page]
exprtk/exprtk_simple_example_09.cpp at master · ArashPartow/exprtk · GitHub
ArashPartow
/
exprtk
Public
Notifications
You must be signed in to change notification settings
Fork
322
Star
1k
Code
Pull requests
0
Actions
Security and quality
0
Insights
Additional navigation options
Code
Pull requests
Actions
Security and quality
Insights
Expand file tree
Breadcrumbs
exprtk
/
exprtk_simple_example_09.cpp
Copy path
More file actions
More file actions
Latest commit
History
History
History
180 lines (157 loc) · 6.94 KB
Breadcrumbs
exprtk
/
exprtk_simple_example_09.cpp
Copy path
File metadata and controls
180 lines (157 loc) · 6.94 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
**************************************************************
* C++ Mathematical Expression Toolkit Library *
* *
* Simple Example 09 *
* Author: Arash Partow (1999-2025) *
* URL: https://www.partow.net/programming/exprtk/index.html *
* *
* Copyright notice: *
* Free use of the Mathematical Expression Toolkit Library is *
* permitted under the guidelines and in accordance with the *
* most current version of the MIT License. *
* https://www.opensource.org/licenses/MIT *
* SPDX-License-Identifier: MIT *
* *
**************************************************************
*/
#
include
<
cstdio
>
#
include
<
string
>
#
include
"
exprtk.hpp
"
template
<
typename
T>
void
primes
()
{
typedef
exprtk::symbol_table<T>
symbol_table_t
;
typedef
exprtk::expression<T>
expression_t
;
typedef
exprtk::parser<T>
parser_t
;
typedef
exprtk::function_compositor<T>
compositor_t
;
typedef
typename
compositor_t
::function
function_t
;
T x =
T
(
0
);
symbol_table_t
symbol_table;
symbol_table.
add_constants
();
symbol_table.
add_variable
(
"
x
"
,x);
compositor_t
compositor
(symbol_table);
//
Mode 1 - if statement based
compositor.
add
(
function_t
(
"
is_prime_impl1
"
)
.
vars
(
"
x
"
,
"
y
"
)
.
expression
(
"
if (y == 1,true,
"
"
if (0 == (x % y),false,
"
"
is_prime_impl1(x,y - 1)))
"
));
compositor.
add
(
function_t
(
"
is_prime1
"
)
.
var
(
"
x
"
)
.
expression
(
"
if (frac(x) != 0)
"
"
return [false];
"
"
else if (x <= 0)
"
"
return [false];
"
"
else
"
"
is_prime_impl1(x,min(x - 1,trunc(sqrt(x)) + 1));
"
));
//
Mode 2 - switch statement based
compositor.
add
(
function_t
(
"
is_prime_impl2
"
)
.
vars
(
"
x
"
,
"
y
"
)
.
expression
(
"
switch
"
"
{
"
"
case y == 1 : true;
"
"
case (x % y) == 0 : false;
"
"
default : is_prime_impl2(x,y - 1);
"
"
}
"
));
compositor.
add
(
function_t
(
"
is_prime2
"
)
.
var
(
"
x
"
)
.
expression
(
"
switch
"
"
{
"
"
case x <= 0 : false;
"
"
case frac(x) != 0 : false;
"
"
default : is_prime_impl2(x,min(x - 1,trunc(sqrt(x)) + 1));
"
"
}
"
));
//
Mode 3 - switch statement and for-loop based
compositor.
add
(
function_t
(
"
is_prime3
"
)
.
var
(
"
x
"
)
.
expression
(
"
switch
"
"
{
"
"
case x <= 1 : return [false];
"
"
case frac(x) != 0 : return [false];
"
"
case x == 2 : return [true ];
"
"
};
"
"
"
"
var prime_lut[27] :=
"
"
{
"
"
2, 3, 5, 7, 11, 13, 17, 19, 23,
"
"
29, 31, 37, 41, 43, 47, 53, 59, 61,
"
"
67, 71, 73, 79, 83, 89, 97, 101, 103
"
"
};
"
"
"
"
var upper_bound := min(x - 1, trunc(sqrt(x)) + 1);
"
"
"
"
for (var i := 0; i < prime_lut[]; i += 1)
"
"
{
"
"
if (prime_lut[i] >= upper_bound)
"
"
return [true];
"
"
else if ((x % prime_lut[i]) == 0)
"
"
return [false];
"
"
};
"
"
"
"
var lower_bound := prime_lut[prime_lut[] - 1] + 2;
"
"
"
"
for (var i := lower_bound; i < upper_bound; i += 2)
"
"
{
"
"
if ((x % i) == 0)
"
"
{
"
"
return [false];
"
"
}
"
"
};
"
"
"
"
return [true];
"
));
std::string expression_str1 =
"
is_prime1(x)
"
;
std::string expression_str2 =
"
is_prime2(x)
"
;
std::string expression_str3 =
"
is_prime3(x)
"
;
expression_t
expression1;
expression_t
expression2;
expression_t
expression3;
expression1.
register_symbol_table
(symbol_table);
expression2.
register_symbol_table
(symbol_table);
expression3.
register_symbol_table
(symbol_table);
parser_t
parser;
parser.
compile
(expression_str1, expression1);
parser.
compile
(expression_str2, expression2);
parser.
compile
(expression_str3, expression3);
for
(std::
size_t
i =
0
; i <
15000
; ++i)
{
x =
static_cast
<T>(i);
const
T result1 = expression1.
value
();
const
T result2 = expression2.
value
();
const
T result3 = expression3.
value
();
const
bool
results_concur = (result1 == result2) &&
(result1 == result3) ;
printf
(
"
%03d Result1: %c Result2: %c Result3: %c
"
"
Results Concur: %c
\n
"
,
static_cast
<
unsigned
int
>(i),
(result1 ==
T
(
1
)) ?
'
T
'
:
'
F
'
,
(result2 ==
T
(
1
)) ?
'
T
'
:
'
F
'
,
(result3 ==
T
(
1
)) ?
'
T
'
:
'
F
'
,
(results_concur) ?
'
T
'
:
'
F
'
);
}
}
int
main
()
{
primes<
double
>();
return
0
;
}
Back
|
FazBrowse Home
|
New Git URL